"Yes; that's about one and a half inch in your measure," answered the lieutenant.

Within an hour the reservoir was again in position, and there was no delay in again mounting into the air. "We might take a little trip due east, as far as Toul, and north of that point we may have the privilege of seeing some of the enemy," remarked the lieutenant, as they mounted the machine.

A beautiful silver thread now appeared on the landscape to the east, as they reached their greatest alt.i.tude. Looking back there was a smaller thread to the west, and, apparently, the same distance from their viewpoint. They thus had the opportunity of seeing, at one glance, two of the most noted rivers which figure in the great war,--the Meuse to the east, and the Marne in the west, these streams at this point being within thirty miles of each other.

It was, probably, imprudent for them to take an out-of-the-way course to reach their destination, but the temptation was very great. The sun was still shining brightly when they started from Ligny-en-Barrois, but it was now growing dark from the overspreading clouds, and as soon as Toul was sighted the lieutenant turned the machine northward.

To the west it could now be seen that the threatening clouds were coming up, and they appeared to be sweeping toward the east with great speed, at right angles to the aviators' course.

"I wonder what the lieutenant will do?" queried Ralph half to himself, as he looked at the clouds, and then glanced back to the officer.

The lieutenant shook his head, and pointed the machine further to the left.

"Why, I believe he is going right into it!" remarked Alfred in amazement to Ralph.

But the officer now made a wide swinging turn. A view of the heavens indicated that the storm was an extensive one, and that the speed of the wind had increased most alarmingly, for, in looking down they seemed to stand still over the little hamlet beneath them. The wind, into which they were flying, was traveling at the same speed as the machine.

There was but one course to follow. They must return to the earth, otherwise they would be driven far over into the German lines. By setting the control lever so as to depress the nose of the machine they rapidly descended, the lever being intermittently drawn back to a normal position, so as to keep the ship on an even keel and prevent it from performing a loop in the air.

The landing was easily made, notwithstanding the wind, and they found they were near Commercy, west of the Meuse, about thirty-five miles south of Verdun. A terrific rainstorm then followed, which lasted more than an hour.

"Were you ever in a rainstorm while flying?"

"Never but once," replied the lieutenant, "and that was in thunder and lightning, too, which was the most terrific thing I ever went through."

"Tell us about it!" said Alfred.

"I almost shudder at it when I stop to think of the hour when I faced the lightning right where it is made," said the lieutenant. "It was in the second week of the war, just east of Rheims, when the Germans were sweeping across the frontier and had pa.s.sed Charleville. I had a double-seated Nieuporte, with an a.s.sistant handling the machine, while I was making observations.

"Shortly after getting the first glimpse of the moving German columns I noticed that it was growing dark, but when you are aloft that is not noticed as quickly as when on terra firma. The great hosts of Germans interested me intensely, and we kept on until I estimated that we were fully ten miles behind the advance columns, when my a.s.sistant shouted through the tube: 'Look back; what are your orders?'

"I saw that to continue would be disastrous, so I gave the order to turn. This gave us the first opportunity to determine our speed, or, to state it more accurately, the speed of the wind, for you will recall that when we turned this afternoon, we seemed to stand still above the town.

"Within ten minutes of the time I turned the machine to the west the first heavy rolling clouds seemed to meet us. The earth was quickly blotted from sight, and heavy rumblings were heard, but no indications of lightning. I knew that heavy black clouds were dangerous, and they were so black that it was impossible to see my a.s.sistant, three feet distant.

"I could not decide what to do, so I finally shouted through the tube: 'keep on a straight course to the west,' for I knew that to land at that point would bring us right into the great German column. There was no rain falling at the time, but the cloud was like the densest mist. The machine was still moving,--that is, the engine was merrily humming, and my a.s.sistant's voice startled me as he shouted: 'There is something wrong; compa.s.s out of order.'

"During the flashes I could see him pointing to the compa.s.s, and I leaned over, and caught a glimpse of the dial. The pointer was swinging around violently. The lightning now seemed to be incessant, and the rumbling of the thunders was weird beyond description. Sometimes, immediately after a vivid flash, a thick spray would deluge our faces."

"What were you thinking about while all this was happening?" asked Alfred.

"What impressed me most was the wonderful difference between the appearance of those electrical discharges when viewed in the usual way from the surface of the earth. I did not notice any forked lightning, nor did it show itself in streaks, darting hither and thither. It seemed to be more like b.a.l.l.s of fire, suddenly appearing here and there, and when each ball burst into flame, there would be a crackling sound, at any rate, so it seemed, for I dared not stop the engine.

"But the most remarkable thing was the odor which was present. It had a pungent smell, not at all unpleasant, but decidedly exhilarating in its effects. I suppose we were taking in ample doses of laughing gas, for I a.s.sure you that after the first experience, we had no particular sense of danger. It was most fascinating, and I felt as though I was being raised up on my seat. Occasionally I would try to figure out how this would end, but on the whole it was devoid of terror."

"How long were you in the storm?" asked Ralph.

"Well, I was so fascinated that I had forgotten to look at the watch. I held it before me, and soon noticed that it was nearly five o'clock, so that we were over an hour and a half in the thick of it. During this experience what gave me the queerest feeling was the compa.s.s, the needle of which could not be seen, it swung around with such velocity. Were we going with the storm, or not? That was the thing uppermost in my mind.

If we were being carried along we might be even in Belgium by the time I noted the watch.

"Then I tried an experiment. I ordered my a.s.sistant to make a turning movement. This convinced me that we were really going with the storm, and were now far over into German territory. Strange as it may seem, we were not thrown hither and thither; the ship sailed along smoothly. I feared to make the next experiment,--that is, to direct the machine toward the earth, for, while everything worked perfectly, I had a feeling that it would be safer to reach the earth with an engine running than with a dead one. Slowly the machine went down; it seemed to get lighter, but now the thunder came in sharp claps, and the form of the lightning changed. I could distinctly see what the observer sees when on the earth, long, zig-zag streaks multiplied a hundred times more than anything I ever witnessed while on earth."

"How high were you up when you got out of the clouds?" asked Ralph.

"Seven hundred and seventy meters (about 2,900 feet), as indicated on the barometer."

"Could you see the earth?" asked Alfred.

"No, indeed; the rain was pouring down; it was splashing over us and all about us, and I signalled to go up again, and we soon entered the clouds; but during all this time the needle of the compa.s.s kept spinning, so that we knew nothing of the direction we were traveling."

"But couldn't you tell which way the wind was blowing?" asked Ralph.

"No; we were moving with the great air current, sometimes sailing with it, and at other times against it, but with nothing below to indicate the direction. We could not possibly say whether we were going north or south."

"I think if I should be in the air and couldn't see the earth I would know a way to tell which way the storm was moving," said Ralph.

"How?" asked the lieutenant, as he leaned forward.

"Why, the rain would come down at an angle, if the wind should be blowing, wouldn't it?" replied Alfred.

"Quite true, that would be the case on the earth; but it would not be so up where the raindrops are being formed; there the little particles of water move along with the wind stream; but that is not all; when you are in a machine in a great wind movement, the ship must move through the wind in one direction or the other at all times so as to keep aloft, hence, whether you are going with or against the wind, the rain drops appear to be coming down at an angle, and this, in itself would be sufficient to deceive you, or, at any rate prevent you from determining the direction in which you happened to be sailing."

"How did you get down?" asked Alfred.

"That was the interesting part of it. After a half hour more of flying I again ordered the a.s.sistant to go down two hundred meters. It was now evident that the storm was abating. Soon we again pa.s.sed out of the rain clouds, and the a.s.sistant shouted that he had reached the level indicated. 'Go lower,' I shouted. As we did so it grew lighter, and we began to feel a relief. 'Lower yet,' I ordered. At 600 meters the rain poured steadily, but still nothing was visible."

"You were up then about a half a mile," said Ralph.

"Just about that," was the reply. "Soon we noticed a peculiar white patch, and then another. This was puzzle to me. 'Go still lower,' I shouted, and down went the machine. Then we saw some white houses, and I almost shouted for joy. But where could we be? We were pa.s.sing over a city, a city located within the bend of a large river. I racked my brain to find out where and what it could be. If it was the river Meuse it might be Verdun, or Sedan, or Charleville. We were forced to go down still lower, and then I could see forts, and I felt sure we were over Sedan.

"We were even then going east. I was so agitated that I could hardly speak, and motioned to my a.s.sistant to turn around. He understood, and the ship was swung around; we were now going right into the blinding rain, but we were fifty miles behind the German advance columns, and in order to enable us to make more rapid progress I told the a.s.sistant to change the course nearly due south. We were flying very low, certainly not over a thousand feet.

"Thus far we had not seen a soldier, or any evidences of warfare. In a half hour we sighted another stream. My heart leaped with joy, for I was sure it must be the Aisne. To a.s.sure myself of this we followed the stream for twenty kilometers, and then the forests of Argonne came into sight, thus a.s.suring me of the position. I knew that the army of the Crown Prince was in that region, and it would not be safe to descend; I, therefore, directed the machine to the west, crossed the river, and was about to go still lower, when I heard a boom,--several of them.

"This startled me, you may be sure. 'Up, up!' I shouted. The machine obeyed. We rose to an alt.i.tude of eight hundred meters, then suddenly the engine stopped. My a.s.sistant turned and shouted: 'We have no petrol.' I crawled back and tested the tank. It was empty. 'Volplane to the south,' I said. It was the only thing I could do. Now that the engine was silent the sounds from the earth were startling. There was terrific firing to the right and left, and all about us; but we must go down; there was no help for that.

"Soon the earth again came in sight, and then the location of the batteries was made out by the volumes of smoke, which could be seen at each volley. My a.s.sistant tried to hold up the machine as long as possible, but we were now down to 300 meters, then the barometer registered 250. We both noticed a large, apparently smooth field, and the final volplane began. We landed a hundred feet from a first-line trench, and although the Germans made it hot for us for about fifteen minutes we were soon able to reach the laterals and thus escape their fire. But the machine was in a bad condition when we rescued it that night. It was literally shot full of holes. What is left of it is now in the end warehouse where the sc.r.a.ps are kept."

CHAPTER IX

A CHAPTER OF LESSONS ABOUT THE AEROPLANE

Early the following morning there was intense activity in the camp, and Ralph was among the first to learn the cause of the excitement. Several army divisions had come up in the night, and were bound for the Verdun sector, and from the information obtained it was the intention of the commander to make a terrific a.s.sault in order to break the German lines north of the city.